半圆壁

例句：

1. 1. The architect designed a half-round wall to enhance the room's natural light.
   建筑师设计了一个半圆形的墙壁，以增强房间的自然光线。
2. 2. The artist painted a half-round wall as a backdrop for her exhibition.
   艺术家在展览的背景墙上画了一幅半圆形的墙壁。
3. 3. The construction crew was working on the half-round wall when it suddenly gave way.
   施工队正在修建半圆形的墙壁时，它突然塌陷了。